The Multilingual User Interface (MUI) is a Microsoft Office System feature that gives the end user the ability to change the language of the user interface (UI). For example, an end user working with an English UI is to change the language of the UI to Spanish.

If your application will be used by people who use multiple languages of Office, you can add code to automatically change the language of your UI strings to match the language being used by Office on the user's computer (assuming that the user has the correct resources installed).

To check the current Office UI setting

Add code to the Microsoft Excel Open, Microsoft Excel New, Microsoft Word Open, or Microsoft Word New event to set the language of your UI strings to match the language being used by the version of Office currently running on the user's computer. The code should look like this: